Hello,
up to date SC6…I changed the label background with a copy of SC6Chromo theme. Preview does show the new bg color with advanced theme settings and in settings with grid. When generating, color has not changed. I did use the option “Update the filter theme too”.
Also…since I tried to copy a button set (like 2 weeks ago), all previews of buttons are gone. I have not deleted anything, they just do not show up.